Fine Blanking Small Caliber Weapon Parts
ROCK ISLAND ARSENAL IL ARSENAL OPERATIONS DIRECTORATE
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The objective of this project was to investigate the feasibility of fine blanking small weapon components to close tolerances. Of particular concern was the applicability of the process to higher alloy materials. Eight parts which represented a variety of size, shape, thickness and material were selected. Fine blanking dies and a sample lot of blankings were produced for each part. Five of the test parts were blanked satisfactorily. Two parts could be produced satisfactorily by changing material thickness or blanked configuration. One part was unacceptable due to extensive tears. Fine blanking presses and dies are high cost items. Average tooling cost was 7,922 per die set and equipment costs may be as high as 490,000. The average cost reduction was 5.19 per part. Fine blanking is an effective and cost reducing process when properly utilized. High carbon alloy steels can be successfully fine blanked. Material must be properly annealed as hardness is critical. The fine blanking process is applicable to the production of ordnance parts. However, large production quantities are required to realize an economic advantage.